I use Tide App on my iPhone and find it to be pretty close. It will vibe you the closest station. However, the most useful tidal data I found at big lake is the Wells fishing forcast. Buy an issue of Gulfcoat Fisherman and they will have 3 months of reports in there. It gives you the time that the tide hits .3 knots, the duration, and direction. There is an offset for each specific area so be sure to add or subtract. You can set your watch by the Wells.
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